I just bought a passive 12 string bass (Waterstone TP-12) and all of the other basses I use are 18V active basses. When I plug in the Waterstone, it is missing that low end that the others get with ease. Thinking about adding a preamp pedal in the chain to get that low end grunt. Not distortion, just OOMPH and the booty shaking bass I'm used to getting from my Bongo, etc. I'm unfamiliar with the good / bad / ugly of pedals, so looking for what's good, etc. Any recommendations? THANKS!